ESP32-C3 adapter for the HU-058 LED clock kit

A small two-layer board that replaces the 8051 in the HU-058 / HU-058SE "DIY KIT Electronic Clock" with an ESP32-C3 module. It plugs into the kit's DIP-16 socket (or solders into the footprint) and brings Wi-Fi, NTP time, a web settings page, over-the-air updates, an alarm with melodies and the kit's own room temperature and light sensors to an $8 soldering kit.

The board carries the module, two 0603 10 kΩ pull-ups (R1, R2) for the NTC and LDR, and the DIP-16 pin header. The module's antenna end hangs over a notch at the board edge, clear of copper, for Wi-Fi range.

Variant: ESP32-C3 SuperMini / SuperMini Plus footprint. (A second project covers the Waveshare ESP32-C3-Zero.) - choose the gerbers for the module you have.

Parts to fit besides the PCB: the ESP32-C3 module with its pin header, and R1 and R2 (10 kΩ 0603, 1 %) if you want the sensors. Build order: resistors, module, header.

Open-source firmware (Rust, esp-hal) and the KiCad sources:

https://github.com/anarsoul/esp32clock